This Caterpillar is thin and green,
with the head end extended into two red horn-like points.
A pale yellow lateral line extends from behind
these points to the anal prolegs.
A red spot marks each ventralprolegs.

close-up of head end
(Photo: courtesy of Merlin Crossley, Melbourne, Victoria)

It typically stands twig-like on its anal
prolegs
and single pair of ventralprolegs.
It blends in well with the stalks of its foodplant.
It feeds on various Wattles ( MIMOSACEAE ).

Pupation occurs in the leaf litter. Pupal duration
is three weeks for Caterpillars pupating in December in Melbourne.

The adult is also green, and has two faint white zig-zag lines
across each wing.
The termen of each wing
and the costa
of each forewing are pale orange.
Because of the predominant green colour,
this and related species of moths are called 'Emeralds'.
The moth has a wingspan of about 3 cms.

The eggs are bright green also. They are oval like a rugby football,
slightly flattened above and below and at each end.